Product Warranty Provisions (Schedule Of Accrued Warranty) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Product Warranty Provisions [Abstract]
Warranty accrual, beginning of the fiscal period	$ 364,548	$ 501,212
Accrual adjustment for product warranty	29,774	84,402
Payments made	(63,436)	(221,066)
Warranty accrual, end of the fiscal period	$ 330,886	$ 364,548
Standard product warranty, coverage term	1 year